God, I wish Nintendo made the Pokemon games, because then they might actually not be ugly, terribly optimized garbage. Nintendo owns a minority share of The Pokemon Company, which is also owned by Game Freak and a company called Creatures. Each company takes care of different aspects of the franchise. Game Freak still does all the game development, and I wish they wouldn’t because they obviously don’t care about the franchise anymore and haven’t for quite a while.
PEP (post-exposure prophylaxis) will make it much less likely for you to contract HIV, but you must begin taking it within 72 hours of potential exposure, and the sooner the better.
If you’re in the US, this CDC page has more info about where to find treatment.
A doctor will be able to tell you what other tests you should have, but I imagine they’re going to just want to screen for the usual stuff (chlamydia, gonorrhea, etc).